diff --git a/package_versions.txt b/package_versions.txt
index f9afb61..eb86dc5 100755
--- a/package_versions.txt
+++ b/package_versions.txt
@@ -79,6 +79,7 @@ cookie-parser                           1.4.6
 cookie-signature                        1.0.6                                    npm     
 coreutils                               8.32-4.1ubuntu1                          deb     
 cpp                                     1.0.0                                    npm     
+cron                                    3.0pl1-137ubuntu3                        deb     
 crypt                                   0.0.2                                    npm     
 csharp                                  1.0.0                                    npm     
 css                                     1.0.0                                    npm